Siemens SENTRON 3VA2340-5JP32-0AD0 — 400 A MCCB with Communication
The Siemens 3VA2340-5JP32-0AD0 is a SENTRON molded case circuit breaker rated for 400 A continuous current at 40 °C, with a 3-pole design and onboard communication function. Interrupting capacity reaches 187 kA at 240 V, 121 kA at 415 V and 440 V, and 75.6 kA at 500 V — covering most industrial distribution and motor branch circuits. At 690 V the rating drops to 7.5 kA, so for 690 V applications verify coordination with upstream protective devices.
Thermal Derating and Power Loss
Continuous current holds at 400 A from 40 °C up to 50 °C, then derates linearly: 375 A at 55 °C, 350 A at 60 °C, 325 A at 65 °C, and 300 A at 70 °C. Maximum power loss is 96 W at rated load. Panel builders should account for this heat dissipation in enclosure sizing — the 96 W is not trivial in a sealed cabinet.
Mounting Dimensions and Panel Fit
The breaker measures 248 mm high, 138 mm wide, and 110 mm deep. It mounts on a DIN rail or directly to a panel backplate. The 138 mm width means it occupies three 45 mm pole spaces — standard for a 3-pole MCCB in this class. Verify that the existing panel has at least 110 mm clearance behind the mounting plane for the case depth and wiring bends.